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A long block A is at rest on a smooth horizontal surface. A small block B whose mass is half of A, is placed on A at one end projected along A with some velocity v. The coefficient of friction between the block is $μ$ .

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Before the blocks reach a common velocity the acceleration of A relative to B is

2/3 μ g

Before the blocks reach a common velocity the acceleration of B relative to A is

3/2 μ g

The work against friction is

2/3

of initial kinetic energy of B

The block will reach a final common velocity

v/3

answer is A, C.

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